SEOUL, July 18 (Reuters) - North Korea will issue "an important report" at noon local time(0300 GMT), its state news media said on Wednesday.
"An important report will be issued in the DPRK at 12:00 (local time) Wednesday," KCNA news agency said in a single-line dispatch.
No further details were given by the reclusive state, although the last time the last time the agency used this wording was when leader Kim Jong-il died in December.
The statement caused financial markets in Seoul to fall sharply.
A spokeswoman for the South Korean presidency said she was not aware of what could be in the announcement. Authorities in Seoul also said there were no signs of a nuclear test by North Korea.
The statement comes after young leader Kim Jong-un reshuffled his top military over the past few days, ousting a senior general. (Reporting by Jack Kim; Editing by David Chance)